根据短文及首字母提示填入恰当的单词完成短文。

Dear Ted,    

       Thank you for your i  1    I can't v  2   you this week because I'm very busy. This afternoon I have to go to the c  3   with my brother. You know I like music very much. And on T  4  ，I have to help my brother with his c  5   because he isn't good at chemistry. On Wednesday, I'm having volleyball t  6   with my friends. And on Thursday evening,I have a piano l  7  . I have to help my mother b  8   my sister on Friday.    On w  9  , I'm going to Hong Kong for v  10  . Can you go to Hong Kong with me?

Write soon.

                                                                                                                                                    David

工程造价信息和其他信息一样要保持新鲜度，这体现了工程造价信息的特点是()。

A.专业性

B.多样性

C.动态性

D.季节性